Form for hollow concrete walls



B. FARNESS. FORNI FOR HOLLOW CONCRETE WALLS.

APPuATloN FILED DEC. 14, i920.

. Patented Dec. 27, 1921.

f' :n mg

APPLICATION FILED DEC-14, i920.

Patented DOO. 27, 1921.

3 SHEETS-SHEET 2- a, w M

B. FARNESS.

FORM FOR HOLLOW CONCRETE WALLS. APPLlcATloN FILED Dc.14, |920.

1,401,898. Patented Dec. 27, 1921.

rarer FORM FOR HOLLOW CONCRETE WALLS.

VSpecicaton of Letters Patent. Y Patent-.eed Dec., 27., 1921.

Application filed December 14, 1920. Serial No. 430,665.

To all whom t may concer/rt:

Be it known that I, BENJAMIN FARNEss, of De Forest, in the county of Dane and State of Wisconsin, have invented certain new and useful Improvements in Forms for Hollow Concrete Walls; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use thesame.

My invention relates to the construction of concrete walls for houses and other buildings and particularly to hollow concrete walls, the object of my invention being to provide a simple and highly efficient form or mold for such construction work, the form embodying improved and simple features rendering it capable of being readily removed after the cement has set.

A further object of the invention is to provide in a mold of the type stated improved means for the formation of a window or other opening in the wallv which obviates the necessity of using a finishing casing on either the inside or outside of the building.

In the drawings, Figure 1 is a horizontal sectional view of a portion of my improved form, the mold members for the window opening being shown about centrally of the portion at the left. F ig. 2 is a vertical sectional view on the line 2 2, F ig. 1. VFig. 3 is a horizontal sectional view on line 3 3,

Eig. 2. F ig. 4 shows a portion of the mold members in detached arrangement,'the strips beino vertically placed instead of horizontallv for the sake of clearness.

As shown in the dran ings, I utilize two mold sets, A and B, spaced apart to form the hollow C of the wall, each set including a series of outer or exposed members 1 and a series of inner or concealed members 2.

rlhe outer members 1 are formed of verti. cally disposed boards adapted to be arranged side to side andprovided with bracing uprights 3 at each side of the members 1, complementary uprights being gripped by Uwshaped clamps 4 through each of which is passed an L-shaped locking bolt 5. The inner end of this bolt is screwthreaded and takesy in a threaded opening of a plate 6 adjustable on and supported by aV strip 7. tao that adjacent boardsl may snugly abut these boards, the uprights 3 are transversely grooved as at 8 to accommodate the bolts 5. Angular continuations of the out-er members 1 are readily provided for by braces 9 bolted or otherwise connected with theboards 1.

The inner members 2 of each set A and B are formed of a series of vertically disposed boards 12 to some of which are secured sheet metal plates 13, the width of these plates being greater than the width of the boards to which'they are attached so as to lap the space between the sides of adjacent boards7 and such plates have openings 14 through which the bolts 5 pass for engagement with their locking plates 6. As before stated these' plates are carried by strips 7. There are a number of these strips placed end to end and extending horizontally, the adjacent ends having a lap `joint fit, as indicated at 15. ln order to secure the necessary spacing between the outer members 1 and the inner members 2 to give proper thickness to the concrete I employ wooden blocks 16 at the points where the bolts 5 are used, such bolts remaining embedded in the concrete when the vforms are taken down. Because of their smallness these blocks do not in vany way detract from the effectiveness of the wall. l preferably arrange the strips 7 which lock the boards of the outer mold set in juxtaposition to the strips 7 of the inner mold set so that these elements form a spacing means between the .two mold sets A and B, thus securing the desiredhollow space.

ln the formation of the wall about openings for windows and the like ditliculty has frequently been experienced because of inability to use the mold parts as adopted for vuninterrupted courses of the wall without very material alteration. l avoid this to alarge extent. In Figsl, 2 and 3 l have vshown the falsework fora window opening. A window frame is indicated at 20 supported at its bottom bvtimbers 21. A series of beveled strips 22 is temporarily fastened to the windowA frame at an angle to the plane of the frame Vandthe vertically window frame is usually slightly greater in width than the hollow space formed in the wall,rand asshown herein the beveled strips 22 extend from the window 'casing out-l vardly to the membersl of both the sets A and B and their inclination is Vsuch that" the concrete poured into the spaces between the members l and 2 of each set A and B will have a beveled formation at the windowY when the beveled strips 22 are removed, thus 'ingr casing on the inside ,or outsideu avoiding the necessity of applying a nishinside of the window. `Additional plates 26 are secured to some of the boards and act as keepers for entra `boards 2l". By this arrangement an opening ofy great width can readily be taken care of. Y' n The parts of my improved mold are read- -ily assembled as will be apparent from the descriptionlof each of the parts. lilith Vthe members `properly arranged concrete is poured between the inner and outer mem-Q bers of each set A andB and allowed 'to hardeur Thereafter, the bolts 5 are un,n

screwed from theplates V6, the strips 7 carrying the plates being lifted from the hol` low of the wall. The inner mold members may then be taken out and theouter boards l removed.,` Accessmay then be hadto'the beveled strips22 temporarily secured to the window iframe, or it' it be desiredthese strips may be allowed to remain in place so as to protect the edges of the concrete until all likelihood of damage to these edges in the building operations is removed. Dislodgment of these strips is an easy matter. As before stated the concrete Vabout the window is provided with a beveled tace thus obviating the necessity-ot linishing casings. rlhe strips 7 are shown 'in 4 in vertical Yarrangement solely forl clearness in illustration. ln practice they are placed horizonh tally; e i Y e Y K l claim as my `inventionr Y fl; lnfthe'f construction Aof hollow for maintaining the outer membersot each set in side tosideY alinement', spacing blocks between' the outer and` inner members oit each i set, and 'a V*locking elementV within the adaptedr to Vcooperate with the means for :maintaining the outer members in aline-r lment, complementary locking elements of Arsv Y `transverse Y concreteY walls.' a form including inner and outer spaced` sets of spacedapart members, means Leonesa e between the outer and inner members ot each set, rods extending transversely through said spaced apart members, anda locking element within the space which will form the hollow of thefwall. adapted to cooperate withV the means for maintaining the outer members in alinement comprising strips arranged end `to end'and each having a screw threadedportion for engagement with said transverse rods, complementary locking strips of the inner and outer sets being arranged lace to face to' form spacing means between the inner and outer sets;

3Q ln the construction of hollow concrete wallsfa form including inner and outer spaced sets ofspaced apart upright boards, meanslfor maintaining` the outer boards of v each set inside to side alinement, spacing bloclrs for separating the boards of each set, plates on some of said boards and extending beyond the sides thereof in overlapping engagement with the nent adjacent and alined board, rsaid plates having'openings therein, rods `entendingptransversely' of said spaced apart boardsand throughA the openingsot said plates, one end of said Vrods being screw threaded', and lockingrelements within` the space Vwhich 4will Jiorm the hollow 'of Vthewall comprising strips arranged to interlock end to endyand each having a screw 4'threaded vportion for engagement withv said rods, complementary locking strips oft the inner and outer space being arranged face Yto, ifaee to form spacing means betweenthe inner'and outer sets.

4.111 theconstruction of hollow concrete walls with openings for doors and windows, a` iformuincluding inner Aand outer spaced sets oli-'spaced apart boards,.means for maintaininglthe outer boardsozt each set in side to side alinem'ent, spacing blocks between the outer'andinner boards of each set, a locking element in partwithin the space v which will Yterm Vthe hollow of thewalL-a frame support-edv between the' outer boards oi" eachsetfstrips having their sideedg beveled, such strips being ,temporarily se:- cured to said trame `at an angle to the planes Vthereof-to cause oneibeveled edge to'lie flush *againstn the inner facev of said f outer board. `AV5..ln the construction of hollow concrete e n walls withfopeningsfor doors and windows, space which willy form the hollow of `the wall `side alinement, spacing blocks between the des outer and inner boards of each set, a locking cause one beveled edge to lie flush against element in part Within the spa-oe which Will the inner face of said outer board and form the hollow of the Wall, a. frame supclamping elements for maintaining said l0 ported between the outer boards 01"' each set, beveled strips in position on said frame.

strips having their side edges beveled, suoli In testimony whereof I have signed this strips being temporarily secured to -said specification.

frame at an angle to the planes thereof to BENJAMIN FARNESS. 

